The only thing I can think of when paying for your own domain name and/or email service is what happens when you eventually die? Corporations can outlive human beings hence keeping our content online for the foreseeable future.
This is also a bug. Especially with third-party corporations that have their own motives, and are prone to treat estates differently than they did the person.
If one wants content to be kept online after their passing, then this needs to be setup ahead of time through an explicit arrangement with the host, not just terms in a will that an executor will be powerless to carry out.